The Droz-Farny theorem and related topics - Charles Thas At each point P of the Euclidean plane Pi , not on the sidelines of a triangle A_1A_2A_3...
A note on the Droz-Farny theorem - Charles Thas We give a simple characterization of the Droz-Farny pairs of lines through a point of the plane....
On the Schiffler point - Charles Thas Suppose that ABC is a triangle in the Euclidean plane and I its incenter. Then the Euler lines of ABC, IBC,...
A generalization of the Lemoine point - Charles Thas It is known that the Lemoine point K of a triangle in the Euclidean plane is the point of...
On some remarkable concurrences - Charles Thas In Bruce Shawyer proved the following result. At the midpoint of each side of a triangle, we...
